Exploitation of Electrostatic Field Force for Immobilization and Catalytic Reduction ofo-Nitrobenzoic Acid to Anthranilic Acid on Resin-bound Silver Nanocomposites

The electrolytic reduction of o-nitrobenzoic acid in alcoholic sulphuric acid at a lead cathode was investigated. The effect of various experimental conditions was studied and a maximum yield of 92% of amine obtained under favorable conditions. No evidence of the reduction of the carboxyl group was observed.

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INTERRELATION BETWEEN CATALYTIC REDUCTION RATE AND SOLUBILITY OF NITROBENZOIC ACID ISOMERS

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/ivkkt.20196206.5878 ◽

2019 ◽

Vol 62 (6) ◽

pp. 53-59

Author(s):

Marina P. Nemtseva ◽

Nikolay Yu. Sharonov

Keyword(s):

Liquid Phase ◽

Sodium Hydroxide ◽

Nickel Catalyst ◽

Catalytic Reduction ◽

Solid Phase ◽

Reduction Rate ◽

Ortho Position ◽

Nitrobenzoic Acid ◽

Skeletal Nickel Catalyst ◽

Intramolecular Hydrogen

The solubility of nitrobenzoic acid isomers is determined from the concentration of solution in equilibrium with the solid phase at a temperature of 303 K in an azeotropic aqueous solution of 2-propanol, including additives of acetic acid and sodium hydroxide, with an error of no more than 5%. It is shown that the lowest solubility in all these media is observed for para-nitrobenzoic acid, and the maximum for the meta-isomer. The addition of acid or base to the liquid phase assists an increase in solubility for all isomers of nitrobenzoic acid. The most significant changes in solubility occur in the presence of sodium hydroxide in the water-alcohol solvent. The shift of the maxima in the absorption spectra was compared with the change in the solubility value. It has been established that with increasing solubility, the rate of liquid phase catalytic hydrogenation of nitrobenzoic acid isomers on the skeletal nickel catalyst decreases. А linear correlation between the solubility of reagents and the rate of their reduction is revealed. The observed interrelation for para- and meta-isomers in neutral and acidic aqueous-alcoholic media is mostly caused by the influence of solubility on the adsorption ability of the hydrogenated compound on the surface of the nickel catalyst. Deviations from this dependence in the presence of sodium hydroxide can be explained by ionization of the of nitrobenzoic acid isomers molecules and by redistribution of the forms of hydrogen adsorbed on the surface of the nickel catalyst. The reason of the distinction in a similar correlation for isomers with a substituent in the ortho-position relative to the nitrogroup is the possibility for forming an intramolecular hydrogen bond in all used media.

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Preparation and Application of a Hydrochar-Based Palladium Nanocatalyst for the Reduction of Nitroarenes

Molecules ◽

10.3390/molecules26226859 ◽

2021 ◽

Vol 26 (22) ◽

pp. 6859

Author(s):

Melike Çalışkan ◽

Sema Akay ◽

Berkant Kayan ◽

Talat Baran ◽

Dimitrios Kalderis

Keyword(s):

High Performance ◽

Chemical Structure ◽

Catalytic Reduction ◽

Aqueous Media ◽

Catalytic Performance ◽

Catalytic Reactions ◽

Reusable Catalyst ◽

Ambient Conditions ◽

Nitrobenzoic Acid ◽

Coffee Waste

In the present study, a novel heterogeneous catalyst was successfully fabricated through the decoration of palladium nanoparticles on the surface of designed Fe3O4-coffee waste composite (Pd-Fe3O4-CWH) for the catalytic reduction of nitroarenes. Various characterization techniques such as XRD, FE-SEM and EDS were used to establish its nano-sized chemical structure. It was determined that Pd-Fe3O4-CWH is a useful nanocatalyst, which can efficiently reduce various nitroarenes, including 4-nitrobenzoic acid (4-NBA), 4-nitroaniline (4-NA), 4-nitro-o-phenylenediamine (4-NPD), 2-nitroaniline (2-NA) and 3-nitroanisole (3-NAS), using NaBH4 in aqueous media and ambient conditions. Catalytic reactions were monitored with the help of high-performance liquid chromatography. Additionally, Pd-Fe3O4-CWH was proved to be a reusable catalyst by maintaining its catalytic activity through six successive runs. Moreover, the nanocatalyst displayed a superior catalytic performance compared to other catalysts by providing a shorter reaction time to complete the reduction in nitroarenes.

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